external diameter of iron pipe is 25cm long and its length is 20 cm. if the thickness of pipe is 1cm .Find the Total suface area of pipe.
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stark1234567890:
sry but ur answer is wrong....
ok
Yup
have a nyc day..
nd ty...for helping me
D = 25 cm ⇒ R = 12.5 cm
r = R – thickness = 12.5 – 1 = 11.5 cm
h = 20 cm
TSA of the pipe = 2 πR h + 2π r h + 2 π( R2- r2)
= 2 x 3.14 x 12.5 x 20 + 2 x 3.14 x 11.5 x 20 + 2 x 3.14 ( 12.52 - 11.52)
= 1570 + 1444.44 + 6.28 ( 156.25 – 132.25 )
= 3014.4 + 148.8
TSA = 3163.2 cm2
r = R – thickness = 12.5 – 1 = 11.5 cm
h = 20 cm
TSA of the pipe = 2 πR h + 2π r h + 2 π( R2- r2)
= 2 x 3.14 x 12.5 x 20 + 2 x 3.14 x 11.5 x 20 + 2 x 3.14 ( 12.52 - 11.52)
= 1570 + 1444.44 + 6.28 ( 156.25 – 132.25 )
= 3014.4 + 148.8
TSA = 3163.2 cm2
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